Cannot deserialize JSON object into type 'System.Collections.Generic.List`1[obJson]'

Question

I am trying to Deserialize (using Newtonsoft) JSON and convert to List in c#. It is throwing me error " Cannot deserialize JSON object into type 'System.Collections.Generic.List`1[obJson]'."

Here is my JSON string:

  string webContent = "{\"searchResults\":     [{\"gefId\":0,\"resultNumber\":1,\"distance\":4.2839,\"sourceName\":\"MQA.MQ_34172_HD\",\"name\":\"USER_DEFINED\"},{\"gefId\":0,\"resultNumber\":1,\"distance\":4.2839,\"sourceName\":\"MQA.MQ_34172_HD\",\"name\":\"USER_DEFINED\"}]}";

Conversion, this line is throwing error:

  List<obJson> result = JsonConvert.DeserializeObject<List<obJson>>(webContent);

My custom classes:

public class SearchResults
{
    public int gefId { get; set; }
    public int resultNumber { get; set; }
    public decimal distance { get; set; }
    public string sourceName { get; set; }
    public string name { get; set; }
}

public class obJson
{
    public SearchResults SearchResults { get; set; }
}

L.B · Accepted Answer · 2012-05-29 09:48:15Z

2

Since your json is an object whose searchResults member contains an array, change your obJson as below

public class obJson
{
    public List<SearchResults> searchResults { get; set; }
}

and deserialize as

obJson result = JsonConvert.DeserializeObject<obJson>(webContent);

answered May 29, 2012 at 9:48

L.B

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5 Comments

Naveen Over a year ago

I tried this. Now there is no error but I am getting searchResult as null after deserialization.

L.B Over a year ago

@Naveen have you changed SearchResults to searchResults ? It works on my computer.

Naveen Over a year ago

Yes I did. Here is the code. I am still getting sResult as null. public class obJson { public List<SearchResults> sResult { get; set; } } webContent = "{\"searchResults\":[{\"gefId\":0,\"resultNumber\":1,\"distance\":4.2839,\"sourceName\":\"MQA.MQ_34172_HD\",\"name\":\"USER_DEFINED\"},{\"gefId\":0,\"resultNumber\":1,\"distance\":4.2839,\"sourceName\":\"MQA.MQ_34172_HD\",\"name\":\"USER_DEFINED\"}]}"; obJson result = JsonConvert.DeserializeObject<obJson>(webContent);

L.B Over a year ago

But your list's name is sResult. Change it to searchResults. Or Just copy from my answer don't rename it (You can use also JsonProperty attribute after you get your code working).

Naveen Over a year ago

sorry. Got it. Changed it to searchResults. It's working now. Thank you!

Muhammad Adeel Zahid · Accepted Answer · 2012-05-29 09:48:45Z

1

The problem is with your model or conversely with data you are sending. You are receiving an array and hoping to deserialize it into plain object. You can change your model like

public class obJson
{
    public SearchResults[] SearchResults { get; set; }
}

and your result will be deserialized just fine.

answered May 29, 2012 at 9:48

Muhammad Adeel Zahid

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Comments

Massimiliano Peluso · Accepted Answer · 2012-05-29 09:38:38Z

0

your json is not valid.

Parse error on line 1:
{    \"searchResults\": [
-----^
Expecting 'STRING', '}'

http://jsonlint.com/

answered May 29, 2012 at 9:38

Massimiliano Peluso

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3 Comments

Naveen Over a year ago

Those are the escape characters which I am getting after issuing web request. If I remove array [] then I am able to retrieve single object after Deserializing. I am having problem JSON array [].

Massimiliano Peluso Over a year ago

in your c# object use a List instead of an array

Naveen Over a year ago

Try this {"searchResults":[{"gefId":0,"resultNumber":1,"distance":4.2839,"sourceName":"MQA.MQ_34172_HD","name":"USER_DEFINED"},{"gefId":0,"resultNumber":1,"distance":4.2839,"sourceName":"MQA.MQ_34172_HD","name":"USER_DEFINED"}]}

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